Improvement in harrows



W. GRANGE.

Rotary-Harrow. v Patented Sepa. 2, 1862 N. PETERS. PH

UNITED STATES PATENT OEEICE.

WILLIAM GRANGE, OF AUGUSTA, KENTUCKY.`

IMPROVEMENT IN HARRows.

Specification forming part of Letters Patent No. 36,345, dated September 2, 1862.

To all whom it may concern:

Be it known that I, WM. GRANGE, of Augusta, Bracken county, and State of Kentucky, have invented certain new and useful Improvements in Rotary Harrows 5 and I do hereby deA clare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

My invention relates to harrows which have a rotary motion in combination with the forward or direct motion 5 anditconsists in the arrangement of devices hereinat'ter described.

Figure lis a perspective view of my improved liarrow. Fig. 2 is a sectional view lengthwise through the draft-beam and central stein.

The outer part of the harrow, A, consists of a metal ring, A to which is secured a suitable number ot'short blocks, j',which are set radially, and which carry cach a pair of harrow-teeth,j. This part is connected with a central rotating hub, g, by the curved arms c, each of which branches at a convenient distance from the center into two arms, c', which are attached at their outer extremities to the blocks f, respectively, one arm attaching to each block.

The inner part, B, consists of the metal ring B', the radial arms h, to which the former is secured centrally, and the hub G. The arms h enter the hub Gand receive the through-bolts t'. The hubs G and g, which. are the centers, respectively, ofthe parts A and B of the harrow, are forced to rotate on the central stem, C.

D is the draft-bar. It is bifurcated from a point near the central stem, C, and the two parts D enter the central stem,-G, and are secured thereto by the nuts d', as shown in Fig. 2.

a a are handles, which extend forward from the after side of the barrow, and, receiving a round, b, which passes through the upper end of central stern, C, unite at upper and opposite sides of draft-bar D, where they receive a through-bolt, b, yby which they are firmly secured to central stem, C, and, projecting therefrom laterally or at rightangles with the draftline, carry a cylindrical roller, which rests as a weight on the circular ring A, and rotates thereon as the part of the harrow to which the ring A belongs is caused to rotate.

7c is a stay, by which the arm d and its roller E are retained in a lateral position with reference to the line of draft.

e is an arm secured to C, and projecting therefrom in an opposite direction from the arm d. It carries a weight, F, similar to E, which rests and rotates upon the ring B ofthe inner part of the barrow. The arm e is rendered more inexible by the bow-stay l.

The form and arrangement ofthe arms c and the other parts which havebeen described are such that the outer part, A, of the harrow and the inner part, B, are both free to rotate around the central stem, C, without. A washer, m, is interposed between the central hub, g, and a collar upon the central stem, C. This may be renewed with another of a greater thickness, to compensate for wear producinginequalities in the level of the two parts ofthe harrow.

As the harrow is drawn over the ground by the draft-bar D the weight E, resting upon the ring A at one side thereof, as has been stated, causes the teeth upon that side to enter the earth deeper, and thus offer a greater resistance tothe forward draft of the implement than' is produced by the teeth upon the opposite side of the outer part of the barrow when no extra weight is applied; hence the forward motion of the weighted side is somiewhat retarded, while the motion of the opposite to compensate for the same is accelerated, and thus the entire part A is caused to have a slow rotary in the direction indicated bythe arrows; but the tendency of this unequal resistance would be to cause the barrow to deviate from its central draft-line to a line of central resistance. The draft would thus become indirect, and the draft-chain would interfere with the limbs of the animals, besides occasioningotherobviousinconveniences. Tocompensate for this tendency to side draft the weight F, applied to the opposite side of the inner part of the barrow, produces precisely the same effect u pon that part which has been described with reference to the weight E upon the outer part; but the weight F'being upon the side opposite E, the tendency to side draft which it creates isin an opposite direction 5 hence the side draft promoted by the unequal resistance upon one part of the rotating parts of the barrow is counteracted by a corresponding tendency existing in the other rotating parts of the barrow exerted in an opposite direction. The'implement is thus caused to follow the team in a comparatively-true draftline.

I am aware that rotary harrows consisting nection with the innery rotating frame, B', and of two or more rotating parts `or horizontal roller F, the'two rotatingframes being carried Wheels rotating upon different centers haVe by and rotating concentrcally in opposite dibeen used. I do not therefore claim the use of." rections upon the same central stem, C, as set a barrow of two or more rotating parts, except' forth. when constructed as herein described; but

What l do claim as my invention, and desire v WILLIAM GRANGE.

to secure by Letters Patent, is- Witnesses:

The peculiar arrangement of the arms c and ,JNo. Q. ADAMS, c,outerrotatingframe, A', and roilerE, in con- I S. KLGRAVES. 

